Hoisting apparatus



3 Sheets-Sheet 1.

(in) Andel.)

H. A. PEDRICK.

HOISTING APPARATUS.

No. 525,561. Patented Sept. 4, 1894.

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H. A. PEDRICK. HOISTINGAPPABATUS.

110.525,561. Patented sept.f4,1a94.

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INVENTOR E WardA. Rdridv WITN ESSES i UNITED STATES PATENT OFFICE.

HOIVARD A. PEDRICK, OF PHILADELPHIA, PENNSYLVANIA.

HOISTING APPARATUS.

SPECIFICATION forming Part of Letters Patent No. 525,561, dated September 4, 1894.

Application led January 15, 18 94. Serial No. 496,931. (No model.)

To @ZZ 'whom it may concern.:

Be it known that I, HOWARD A. PEDRIGK,

a citizen of the United States, residing atv Philadelphia, Pennsylvania, have invented certain Improvements in Hoisting Apparatus, of which the following is a specification.

One object of my invention is to so construct a hoisting apparatus intended for operation by compressed air or equivalent motive Iiuid that the hoisting device will occupy the least possible amount of vertical space so as to provide for the maximum amount of lift which the height of the roof or ceiling will permit, a further object being to provide for the rigid locking of the hoisting mechanism so as to maintain the load in any desired position for any desired length of time without, however, interfering with the raising or lowering of the load from the position of rest.

A still further object is `to provide for the operation of the hoist, either for raising or v lowering, as well as for the locking and un.

locking of the same by the manipulation of a single lever. These objects I attain in -the manner hereinafter set forth, reference being had to the accompanying drawings, in which- Figure l, is a longitudinal section, partly in elevation, of a hoisting device constructed in accordance with my invention. Fig. 2, is a transverse section of the same on the line 2-2 Fig. l. Fig. 3, is a plan view partly in section. Fig. 4, is an end view looking in the direction of the arrow Fig. 3. Fig. 5, is a side View illustrating a modification of part of the invention. Fig. 6, is an end view ofthe same partly in section; and Figs. 7 and 8,l are diagrams illustrating other modifications.

A represents the cylinder of the hoist having opposite heads A each of which is preferably provided with a linka so that the cylinder can be hung to the ceiling or roof structure of the room or apartment in which the hoist is to be used and can thus be as close as possible to said ceiling or roof so as to occupy but little vertical space and permitof the maximum amount of hoist.y

To the cylinder is adapted a piston or plunger B secured to the inner end of the piston rod B which has formed on itsunder side a rack b engaging with a pinion b upon the hoisting shaft or spindle D, the latter turning in roller bearings d formed in a box B2 projecting from the front head of the cylinder, and in a cap B3 applied to the under side vofsaid box, the box also constituting a guide ofthe hoisting chain F', the loop of this chain depending on one side of the hoisting wheels and the ends of the chain depending on the other side and being connected to the yoke F2 of the hoisting hook F3 so that the outward movement of the piston B will cause the shaft D and its chain wheels to turn forward and raise the hoisting hook while inward movement of the piston will cause a reverse movement of the shaft and its hoisting wheels and a lowering of the hook.

The compressed air or other motive fluid under pressure is admitted to the rear end of the cylinder A through a pipe f through which the flow of the motive fluid is controlled by an ordinary two-way valve contained in the valve chest Gr, the stem of said valve having a lever H, the arms of which may be provided with suitable pendent ropes Aor chains so that said lever can be readily manipulated from the door of the room or apartment in order to cause it to assume either of three positions,and thus either admit the compressed air to the rear end of the cylinder A, cut ed the ow of air thereto, or permit of the escape of air therefrom. In the first case, the piston will be projected and the load raised, and in the second case the air will be confined in the cylinder and the load will remain suspended, while inthe third case the air will be exhausted from the cylinder and the load will be permitted to descend. In order, however, to positively lock the load in any position to which it has been raised or lowered and in which it is desired to permit it to remain for any considerable length of time, I: employ a detent g hung to the box B2 at the front end of the cylinder A and held in engagement with the rack b on the under side of the piston rod by means of a spring g', and in order to effect the automaticl removal of said detent from engagement with IOO y A Illf- "n the rack prior to the lowering of the load I employ a trip arm h hung to a shaft which is mounted in bearings on the box B2 and has an arm t" connected by a rod t2 to one armof the valve operating lever H. The deten't g projects laterally beyond the piston rod B as shown in Fig. 4, and the trip arm 7L is adapted to act upon this projecting portion of the detent when the trip arm is lowered the detentbeing thus depressed and the piston rod released, this operation taking place upon such movement of the valve operating lever H as will permit of the escape of the air from the rear end of the cylinder.

A modii'ed form of the device is that shown inV Fig. 7 in which the detent is in the form of a bell crank lever I, one arm of which engages with the rack of the piston rod, the other arm being slotted for the passage of a rod m, which has a head m adapted, upon the retraction of the rod, to elfect such movement of the detentas will withdraw it from engagement with the rack, the spring g acting as before.

In Figs. 5 and 6 I have illustrated another form of detent the rack in this case being in the form of a ratchet wheel fnl secured to one of the chain Wheels F and the detent consisting of a lever .I one arm of which engages with the ratchet wheel and is acted upon by the spring g', the other arm being acted upon by the tripper arm h.

The mounting of the shaft D in bearings carried by the head of the hoisting cylinder provides an extremely compact and efficient form of support and thus enables me to avail myself of the advantages due to the disposal of the hoisting cylinder horizontally and close to the ceiling or roof beams.

An even more compact arrangement may, if desired, be adopted as shown in Fig. 8 by locating the hoisting wheels transversely in respect to the cylinder and mounting them upon or forming them integral with a nut engaging directly with a thread or threads cut upon the piston rod B so that as the latter is projected the hoisting wheels will be turned in one direction and when the piston rod is retracted, will be turned in the opposite direction. In this case the detent lever K may conveniently be arranged transversely to the cylinder, and adapted to act upon a circular rack s formed between the two hoisting wheels, the tripper being in the form of a lever M.

It will be observed that' the hoisting shaft, its bearings, pinion and hoisting wheels, are all carried by the head of the cylinder, so that the entire structure is single and self-contained and is ready for use immediately upon suspending it from its support by means of the links a, and the entire structure can be transported, set up, or removed, Without disturbing therelation of any of the parts to each other.

Having thus described my invention, I claim and desire to secure by Letters Patent- 1. The combination of the cylinder and means fer mounting the same horizontally, n with a hoisting wheel shaft adapted to bear ings formed upon the cylinder head, a piston j and piston rod, and means whereby the r0- ciprocation of said piston rod is caused to l eect the rotation of said hoisting shaft, the #if whole constituting a single, selfcontaiued f structure substantially as specified.

2. The combination of the cylinder, its pia ton and piston rod having a rack, means for mounting said cylinder horizontally,the hoist- 8g l ing shaft adapted to bearings formed upon the head of the cylinder, the hoisting chain i adapted to wheels on said shaft, anda pinioll carried by the shaft, and engaging with the rack of the piston rod, the whole constituting a single, self contained structure, substan- .1 i tially as specified.

3. The combination of the hoisting cylin-` der, the piston therein hoisting mechanism operated by said piston and havingas oneof gn its elements a rack, a detent engaging with said rack, and serving to lock the same and prevent the descent of the load, a valve for controlling the flow of motive fluid to and from the cylinder, a lever for operating said ,il

valve and means whereby the movement of said lever necessary to exhaust the motive fluid from the cylinder is caused to movethe t detent out o'f engagement with the rack, substantially as specified. t

4. The combination of the hoisting cylil der, its piston having a rod with rack thereon, a hoisting shaft with pinion engaging th. rack, a detent engaging with said rack to pn vent the descent of the load, a valve controlling the flow of motive fluid to and from the hoisting cylinder, an operating lever for said valve, and means whereby the movament of said lever in order to exhaust the m0` tive fluid from the cylinder is caused to effect i, the release of the detent from cngagemel with the rack of the piston rod, substantially; as specified. Y

5. The combination of the hoisting cylib der and its piston, hoisting mechanism op erated by the movement of said piston and. having as one of its elements a rack, a dan tent engaging with said rack, and serving t lock the same so as to prevent the descente! the load, a trip arm for moving said detel` out of engagement with the rack, and mem for operating said trip arm, substantially specified.

In testimony whereof I have signed my name to this specification in the presence ci two subscribing witnesses.

HOWARD A. PEDRICK.

Witnesses: y.

FRANK BECHTOLD, WILLIAM A. BARR. 

